Simple Rules:
In one sentence/statement (think of twitter, 120char max) make a statement that you feel will be true within a few months of D3's release.
Check back when the thread gets Necro'd around that time and see if you can say "I told you so".
Any thread that is "edited by" after the game's release is null and void. I'll start:
You'll use only 2-3 skills almost exclusively, aside from some specific resistance/gimmick boss, the rest will be "useless" in comparison.

I'd go so far as to say that this will probably happen fairly immediately, as everyone scrambles to sell their item for a nickel less than the next guy. But it will probably rebound sometime after the first month or so, once most people give up on trying to sell every item they pick up.

Warning to people posting in this thread: Keep it civil. This is a warning to anyone posting in this thread. Was going to delete it based on the title, but it went in a different direction than I expected.

It would be really interesting if searching the archives you find posts of yours that called something correctly. I don't mean "The skill system could well change before release", something more specific like the demon hunters resource system for example.

Keep in mind that making a prediction that can be proven makes for a much more interesting thread. Generalized things like "everyone will ...." are unprovable, so you can't really "i told you so" to it in the future. Saying that " XXX will be a huge success" can be proven, with sales figures / press statements.